Brake operating mechanism



Oct. 31, 1933. G. H. HUNT ET AL BRAKE OPERATING MECHANISM Filed Deo. l1, 1929 INVENTOR GEORGE H. HUNT BY dorm Y.. Dawns A TTORN E Y Patented Oct. 31, 1933 L l, I

UNITED STATES `PATENTOFFICE'f-f v 1.932,89et. t A A t BRAKE OPERATING ivrioroirustr- Y i George H. num, south Bend, and John E. Downs, Indianapolis, Ind., assignors to Bcn-l lix Brake Company, Chicago, Ill., a corpora- `tion of Illinois v Application December 11, Serial No. 413,163

5 claims. (ci. iss-e718 This invention relates to brake operating would be no yielding in thisbracket to permit mechanism and is illustrated as embodied in a such pivotal movement. As aconsequence, there bearing through Which-the brake operating shaft is a tendency for the shaft 20 to twist in its bear- A. runs. It is especially intended for use in an oper- -ing in bracket 22 and in extreme'cases to bind.

5 ating shaft support bracket which is slidably This, of course, results in uneven wear and gives 50 mounted to permit compensation for uneven wear considerable trouble in the adjustment and opof the shoes on the two sides of the operating shaft eration of the brake. To overcome this difficulty, or cam. The main object of the invention is to We have provided in the bracket 22 a bearing obviate all chances of binding of the shaft due member 32 which on its outer side has been given t this shifting movement of the bracket. The a spherical shape and which is supported in a 65 operating shaft often extends through the shiftspherically shaped socket 33 in the bracket 22, as able bracket at one end and into a fixed socket clearly shown in the drawing. at the other end. When the bracket shifts to The bearing may consist of either the plain l compensate for wear, it ceases to be exactly in type of bearing 132 shown in Figure 3 or the l line with the fixed socket and hence there is a roller type of bearing 32 shown in Figures 1 70 relative. twist between the' bracket and the shaft. and 2, or any other type desired. In the plain A main feature o-f the invention is the inclusion type of bearing (Figure 3), the socket for the of a spherical bearing in the bracket to permit the bearing is preferably hanged, as shown at 137,

shaft to swivel with respect to the bracket. with sufficient clearance around the shaft to In the drawing in which two embodiments of permit the necessary swiveling. When the roller 7F this invention are shown: bearing type is used, rings 34 (Figure 2) may be Figure 1 is a vertical sectional view of one provided at the ends of the rollers 36 as desired. embodiment of this invention in which a roller Sufficient clearance is left between these rings bearing is used with the socket shown diagram- Aand flanges 37 to permit the swiveling. A cover matically; plate 38 may be provided in either case and may 80 Figure 2 is a horizontal section along the line be held on in any suitable manner as by passing 2-2 of Figure 1; and a cotter pin 35 through the shaft 20.

Figure 3 is a vertical sectional view of another As will be seen from the Y drawing and the embodiment of this invention in which a plain above description, the bracket 22 can now slide bearing is used. to compensate for dierential wear of the shoes 85 The brake mechanism is supported within the without any danger of binding in the bearing 31. brake drum 10 by a backing plate 12 and cone This is because when such shifting takes place, sists of any well known type of brake, but preferthe rod 20 and bearing 31 or 32 swivels in the ably having one or more fixed anchors circumbracket 22, thus permitting the shaft 20 to rotate ferentially spaced from the actuator in back of about the fixed socket 30 without setting up 90 the cam 14. Two brake shoes 16 and 18 may constrains. If desired, a similar bearing may be tact with and be actuated by this cam. The provided in the socket 30, although this is not `cam is mounted on the operating shaft 2D which ordinarily necessary. v extends through the backing plate and is carried While two illustrative embodiments of our 40 on a special bracket 22 which is held in the backinvention have been described in detail, it is not 95 ing plate by the bolts 24 or other suitable means our intention to limit the scope of the invention which is are customarily mounted in slots 26 as to those particular embodiments or otherwise shown. During the course of time, one of the than by the terms of the appended claims. shoes will often Wear more quickly than the other. We claim: It is necessary that the cam 14 shift toward one 1. Brake operating mechanism including an 100 shoe sumciently to compensate for the difference Aoperating shaft, a support therefor, said support in Wear or it will fail to exert equal thrusts on including a bearing having rolling elements, said both shoes. The slots 26 are provided to permit bearing being so constructed and arranged as this, the bracket 22, cam 14 and shaft 2G shifting to be movable as a unit in the plane of said 5o as aunit the necessary amount. support and also rotatable about an axis in 105 As the inner end of the shaft 20 is often said plane. mounted on a fixed socket 30, the shaft'igil cannot 2. A brake mechanism comprising a drum, a. move with pure translation, but must rotate backing plate, friction means, an actuating means, slightly about the socket 30 as a pivot. With the an operating shaft for said actuating means, a ordinary type of bearing in bracket 22, there support for'said shaft mounted on said backing 110 plate and including a bearing constituting a plurality of rollers, a member of spherical outer shape engaging said i rollers, and a spherical socket 'in which said member is movable.

3. A brake mechanism comprising a drum, a friction element, a backing plate, a bearing rotataoly and slidably mounted on said backing plaie. actuating means for said friction element positioned within said drum, and an operating shaft extending uninterruptedly through' said bearing into said drumvand connectedv to said actuating means. f

4. Brake mechanism including friction means, actuating means associatedl therewith, said actuating means being operated by a shaft, two spaced support-s for said shaft, one of which is laterally shiftable with respectto the other, and a bearing carrying said shaft through one of said supports, said shaft and bearing being swivelly mounted in said support.

5. A brake mechanism' comprising a,A drum, a

tending uninterruptcdly through said passage into said drum and connected with said actuating means.

GEORGE H. HUNT. JOHN E. DOWNS.

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